<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://cdn.bootcdn.net/ajax/libs/react/17.0.1/umd/react.production.min.js"></script>
  <script src="https://cdn.bootcdn.net/ajax/libs/react-dom/17.0.1/umd/react-dom.production.min.js"></script>
  <title>小白也能听懂的 React 教程</title>
</head>

<body>
  <div id="root">
    <div>

      <script type="bable/text">
        let number = 0
        render()
        function render() {
          ReactDOM.render(
            <div>
              123
            </div>,
            document.querySelector("#root")
          )
        }
      </script>
</body>

</html>